Stephen Harper Says Efforts to Isolate Russia May Have Economic Costs but Are Necessary

THE HAGUE—Canadian Prime Minister Stephen Harper said Tuesday the Group of Seven's efforts to isolate Russia could have global economic costs, but said the pain is necessary because Moscow must "pay a price" for its intervention in Ukraine.

At a news conference coinciding with an end to a nuclear-security summit in the Dutch capital, Mr. Harper—among the fiercest critics of Russia's actions in Ukraine—said the G-7 stands...